EP1456863B1 - Relais électromagnétique pour disjoncteur basse tension - Google Patents

Relais électromagnétique pour disjoncteur basse tension Download PDF

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Publication number
EP1456863B1
EP1456863B1 EP02798342.8A EP02798342A EP1456863B1 EP 1456863 B1 EP1456863 B1 EP 1456863B1 EP 02798342 A EP02798342 A EP 02798342A EP 1456863 B1 EP1456863 B1 EP 1456863B1
Authority
EP
European Patent Office
Prior art keywords
fixed element
moving plate
core
circuit breaker
electromagnetic relay
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02798342.8A
Other languages
German (de)
English (en)
Other versions
EP1456863A1 (fr
Inventor
Lucio Azzola
Stefano Besana
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB SpA
Original Assignee
ABB SpA
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Filing date
Publication date
Application filed by ABB SpA filed Critical ABB SpA
Publication of EP1456863A1 publication Critical patent/EP1456863A1/fr
Application granted granted Critical
Publication of EP1456863B1 publication Critical patent/EP1456863B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/74—Means for adjusting the conditions under which the device will function to provide protection
    • H01H71/7463—Adjusting only the electromagnetic mechanism

Definitions

  • the present invention relates to an electromagnetic relay for a low-voltage circuit breaker, i.e., for applications with operating voltages up to 1000 V, having improved characteristics.
  • the present invention relates to an electromagnetic relay, of the type with adjustable tripping threshold and high field gradient, which has, with respect to the known type of relay, a wider and more linear adjustment range.
  • these devices comprise one or more electric poles that constitute the interruption section of the circuit breaker; each pole comprises at least one arc chute and two electrical contacts, a fixed one and a moving one, which can be mutually coupled/uncoupled; in turn, the contacts are connected electrically to the phase or neutral conductor associated with said pole by virtue of suitable connection terminals.
  • Each electrical pole is provided with a suitable current sensor, normally constituted either by a current sensing transformer, whose primary winding is constituted by the conductor to which said pole is connected, or by a magnetic relay whose winding coil is again constituted by said conductor.
  • These magnetic relays can be considered essentially as two-stage transducers, i.e., transducers capable of converting initially the electric energy into magnetic energy and then the magnetic energy into mechanical energy.
  • the sensitive part of a magnetic relay in fact comprises an electromagnet that has a plate made of ferromagnetic material, which subjects a suitable lever system to mechanical actions that depend on the value of the magnetic field generated by the electromagnet; said magnetic field in turn depends on the intensity of the current that circulates in the corresponding electrical conductor.
  • the mechanical actions produced in the lever system are then appropriately directed in input to a protection unit, which causes the safety release or opening of the circuit breaker.
  • the magnetic relays used in low-voltage circuit breakers can be of the fixed or adjustable type, the latter being the case of the present invention.
  • adjustable relays allow to set the tripping threshold of the protection unit of the circuit breaker over a given range; in the current art, the methods by which the tripping threshold is adjusted allow to obtain devices that can perform their required functions adequately but have some critical aspects.
  • the threshold of magnetic relays is set by using suitable adjustment means, by acting on the magnetic circuit of the relay itself, which is substantially constituted by two parts: a fixed part, which comprises a ferromagnetic element, a core and a coil, and a moving part, which comprises a plate that is also made of ferromagnetic material.
  • a first solution commonly known as gap variation
  • the second solution commonly known as magnetic coupling variation
  • the adjustment consists in gradually modifying the relative position of the ferromagnetic plate of the moving part and the fixed part of the electromagnet, increasing or reducing the efficiency of the conversion of the magnetic energy generated by the electromagnet into mechanical energy induced in the lever system that actuates the safety release or opening device of the circuit breaker.
  • Document DE-U-29515254 discloses an electromagnetic relay with adjustable tripping threshold according to the preamble of claim 1.
  • the aim of the present invention is to provide an electromagnetic relay with adjustable tripping threshold for a low-voltage circuit breaker that allows to obviate the drawbacks described above and in particular allows an extremely effective and optimized setting of the tripping threshold with respect to known types of adjustable relay.
  • a first object of the present invention is to provide an electromagnetic relay with adjustable tripping threshold for a low-voltage circuit breaker that allows to extend considerably the useful adjustment range of the tripping threshold even in compact relays.
  • Another object of the present invention is to provide an electromagnetic relay with adjustable tripping threshold for a low-voltage circuit breaker that allows to obtain, in a simple and reliable manner, an extremely precise and uniform response in setting the tripping threshold.
  • Another object of the present invention is to provide an electromagnetic relay with adjustable tripping threshold for a low-voltage circuit breaker that has a reduced number of parts and a high degree of reliability, with improved functional performance.
  • Another object of the present invention is to provide an electromagnetic relay with adjustable tripping threshold for a low-voltage circuit breaker that is easy to manufacture and at modest costs.
  • the magnetic relay according to the invention has a geometry that allows to utilize simultaneously the different effect of multiple physical phenomena occurring in different regions of the magnetic circuit, i.e., the variation of the gap and of the magnetic coupling, allowing to obtain, with respect to known relays, a considerable extension of the adjustment range of the tripping threshold with great precision and reliability of behavior within the adjustment range.
  • the magnetic relay with adjustable tripping threshold for a low-voltage circuit breaker comprises a magnetic circuit that has a fixed part, which comprises at least one coil 1, one magnetic core 2 and one fixed element 3 made of ferromagnetic material, typically a ferromagnetic plate, and a moving part, which is provided with a moving plate 4 also made of ferromagnetic material, which is functionally connected to tripping threshold adjustment means.
  • Said adjustment means designated by the reference numeral 10 by way of example in Figure 4 , comprise, according to the requirements and/or needs of the application, a rack system or a slider or a screw or a knob et cetera.
  • the moving plate 4 and/or the fixed element 3 have a contoured body that allows, by acting on said adjustment means 10, to set the tripping threshold by simultaneously varying the gap between the moving plate 4 and the fixed element 3 and the magnetic coupling between said moving plate 4 and the core 2.
  • the moving plate 4 has a contoured body that allows, during the setting of the tripping threshold, a simultaneous variation of the gap and of the magnetic coupling; in turn, the fixed element 3 has a contoured body that allows, during the setting of the tripping threshold, a variation of the gap, interacting in doing so with the contoured body of the moving plate 4, as detailed in the description that follows.
  • the moving plate 4 has a substantially U-shaped body that is arranged, during the assembly of the various parts of the relay, so that its concavity is directed toward the fixed element 3, so that at least part of its surface faces the surface of said element 3 and the coil 1 and the core 2 are interposed between them.
  • the central portion 5 of the U-shaped body has, along the edge 6 arranged at the core 2, a recessed portion 7; preferably, said recessed portion 7 has a contoured profile that is geometrically complementary with respect to the profile of the core 2.
  • the portion 7 preferably has a curved profile; as an alternative, depending on the specific requirements of application and/or on the shape of the profile of the core 2, the recessed portion 7 might be shaped differently, so long as it is shaped in a manner that is compatible with the application.
  • At least one of the two lateral arms, respectively 8 and 9, of said U-shaped body has, in a side view, a substantially oblique profile.
  • both lateral arms 8 and 9 of the U-shaped body have an oblique profile.
  • the moving plate 4 is connected to an additional contoured plate 20 made of non-ferromagnetic material; said plate 20 is connected in a movable manner to an additional component 30 that is rigidly coupled to the fixed element 3 by virtue of a spring 21 and two engagement elements 22 that are coupled to corresponding pivots 14 formed on said element 30.
  • the plate 20 is provided with a contoured end 23 that is suitable to interact functionally with release means (not shown) of the circuit breaker.
  • the fixed element 3 has a substantially flat central portion 11 at which the coil 1 and the core 2 are arranged, and has two lateral wings 12 and 13 that protrude transversely from the flat central portion 11, at the sides of the coil 1. Both wings 12 and 13 of the fixed element 3 have oblique profiles. Said profiles, as shown in Figure 2 , are arranged so that each one faces a corresponding oblique profile of the moving plate 4 and is substantially parallel thereto.
  • the action on the adjustment means causes the sliding, on a substantially horizontal plane, of the moving plate 4 with respect to the fixed element 3; accordingly, the moving plate 4 passes for example from an initial position, shown in Figure 2 , to a final position, shown in Figure 3 .
  • the oblique arms 8 and 9 of the plate 4 move away from the corresponding oblique profiles of the wings 12 and 13, and this allows to increase the gap.
  • the relay 100 according to the invention is particularly suitable for use, individually or in combination with additional relays 100, in an automatic low-voltage power circuit breaker, be it of the standard, current-limiting, single-pole or multiple-pole types, with single or double contacts for each pole, et cetera. Accordingly, another aspect of the present invention is constituted by an automatic power circuit breaker, characterized in that it comprises at least one electromagnetic relay 100 of the type described above.
  • the relay according to the invention allows to achieve the intended aim and objects, providing a series of significant advantages with respect to the relays of the known art.
  • the relay can be produced cheaply and is characterized by very easy practical use; moreover, within the tripping threshold it has improved reliability and great precision, which can also be observed in applications using highly miniaturized relays or using multiple relays adjusted simultaneously by means of a single device, as shown for example in Figure 4 .
  • the lateral arms of the moving plate 4 and/or the wings of the fixed element 3 might have an oblique profile that is not perfectly straight and is for example slightly arc-like.
  • the materials used, so long as they are compatible with the specific use, as well as the contingent shapes and dimensions, may be any according to the requirements and the state of the art.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Relay Circuits (AREA)
  • Electronic Switches (AREA)

Claims (3)

  1. Relais électromagnétique (100) avec seuil de déclenchement de puissance ajustable pour un disjoncteur basse tension, comprenant un circuit magnétique qui a une partie fixe qui comprend un élément fixe (3) réalisé avec un matériau ferromagnétique, un noyau (2), et au moins une bobine d'enroulement (1), et une partie mobile qui a une plaque mobile (4) réalisée avec un matériau ferromagnétique et agencée pour faire face au moins partiellement audit élément fixe (3) avec la bobine (1) intercalée entre ladite partie mobile et ledit élément fixe (3), ladite partie mobile étant fonctionnellement raccordée aux moyens pour ajuster le seuil de déclenchement de puissance (10) ;
    caractérisé en ce que :
    ladite plaque mobile (4) comprend un corps en forme de U qui est agencé de sorte que sa concavité est dirigée vers ledit élément fixe (3), une partie centrale (5) dudit corps en forme de U ayant une partie évidée (7) le long d'un bord (6) agencé au niveau dudit noyau (2), ladite partie évidée ayant un profil façonné qui est géométriquement complémentaire par rapport au profil dudit noyau (2) et ayant des bras latéraux (8, 9) avec un profil sensiblement oblique ;
    ledit élément fixe (3) a une partie centrale sensiblement plate (11), au niveau de laquelle la bobine (1) et le noyau (2) sont positionnés, et des ailes (12, 13) faisant saillie transversalement de la partie centrale plate au niveau des côtés de la bobine (1) et ayant un profil sensiblement oblique, chaque profil oblique desdites ailes correspondant à un profil oblique de ladite plaque mobile (4) et étant sensiblement parallèle à ce dernier ;
    dans lequel, en agissant sur lesdits moyens d'ajustement (10), le seuil de déclenchement de puissance est réglé en modifiant simultanément l'espace entre la plaque mobile (4) et l'élément fixe (3) et le couplage magnétique entre la plaque mobile (4) et le noyau (2).
  2. Relais électromagnétique (100) selon la revendication 1, caractérisé en ce que ladite plaque mobile (4) est agencée, par rapport audit élément fixe (3), de sorte qu'elle peut être ajustée en coulissant sur un plan sensiblement horizontal.
  3. Disjoncteur automatique, caractérisé en ce qu'il comprend au moins un relais électromagnétique selon une ou plusieurs des revendications précédentes.
EP02798342.8A 2001-12-20 2002-12-16 Relais électromagnétique pour disjoncteur basse tension Expired - Lifetime EP1456863B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITMI20012717 2001-12-20
IT2001MI002717A ITMI20012717A1 (it) 2001-12-20 2001-12-20 Rele' elettromagnetico per un interruttore di bassa tensione
PCT/EP2002/014405 WO2003054898A1 (fr) 2001-12-20 2002-12-16 Relais electromagnetique pour disjoncteur basse tension

Publications (2)

Publication Number Publication Date
EP1456863A1 EP1456863A1 (fr) 2004-09-15
EP1456863B1 true EP1456863B1 (fr) 2016-06-29

Family

ID=11448722

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02798342.8A Expired - Lifetime EP1456863B1 (fr) 2001-12-20 2002-12-16 Relais électromagnétique pour disjoncteur basse tension

Country Status (9)

Country Link
US (1) US6930575B2 (fr)
EP (1) EP1456863B1 (fr)
JP (1) JP4177261B2 (fr)
CN (1) CN1265416C (fr)
AU (1) AU2002363878A1 (fr)
ES (1) ES2592905T3 (fr)
IT (1) ITMI20012717A1 (fr)
RU (1) RU2294577C2 (fr)
WO (1) WO2003054898A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7130173B2 (en) * 2003-07-08 2006-10-31 Square D Company Direct force armature for a trip assembly
CN101710551B (zh) * 2009-11-26 2012-01-04 天津市百利电气有限公司 带有后备保护装置的智能化断路器
KR101276370B1 (ko) * 2012-01-17 2013-06-18 현대중공업 주식회사 배선용 차단기
CN104124114B (zh) * 2014-06-24 2016-08-24 上海诺雅克电气有限公司 多极电磁脱扣器的短路保护动作电流调节方法和装置
CN107768203B (zh) * 2016-08-15 2019-10-11 浙江正泰电器股份有限公司 直动式电磁脱扣装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3421123A (en) * 1967-06-19 1969-01-07 Gen Electric Electric circuit breaker with magnetic tripping means
US4706054A (en) * 1986-09-15 1987-11-10 General Electric Company Thermal magnetic trip unit for molded case circuit breakers
FR2626713B1 (fr) 1988-01-28 1990-06-01 Merlin Gerin Declencheur electromagnetique a reglage du seuil de declenchement
FR2639148B1 (fr) 1988-11-16 1991-08-02 Merlin Gerin Declencheur magnetique a large plage de reglage du seuil de declenchement
DE29515254U1 (de) 1995-09-23 1995-12-14 Moeller GmbH, 53115 Bonn Auslöseeinrichtung aus einem elektromagnetischen Schnellauslöser und einem mit diesem in Wirkverbindung stehenden Bimetallstreifen eines Überstromauslösers

Also Published As

Publication number Publication date
CN1265416C (zh) 2006-07-19
ES2592905T3 (es) 2016-12-02
JP2005513730A (ja) 2005-05-12
WO2003054898A1 (fr) 2003-07-03
CN1606790A (zh) 2005-04-13
US20050007220A1 (en) 2005-01-13
US6930575B2 (en) 2005-08-16
EP1456863A1 (fr) 2004-09-15
AU2002363878A1 (en) 2003-07-09
ITMI20012717A1 (it) 2003-06-20
RU2004122126A (ru) 2005-08-10
RU2294577C2 (ru) 2007-02-27
JP4177261B2 (ja) 2008-11-05

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